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3D shaders
http://3dshaders.com/
Online home of the OpenGL Shading Language (orange) book
3DLabs OpenGL Shading Language
http://www.3dlabs.com/support/developer/ogl2/index.htm
OpenGL Shading Language information site
OpenGL Shader Designer
http://www.typhoonlabs.com/
A shader development IDE developed for writing vertex and fragment (pixel) shaders in glsl. Freeware editor release
OpenGL Shading Language
http://www.opengl.org/documentation/oglsl.html
OpenGL 1.4 and higher shading programming language